Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지
DOI QR코드

DOI QR Code

Effect of Variation in Particle Size of WC and Co Powder on the Properties of WC-Co Alloys

WC와 Co원료 입자크기 변화에 따른 WC-Co계 초경합금의 특성 변화

  • Chung, Tai-Joo (School of Materials Science and Engineering, Andong National University) ;
  • Ahn, Sun-Yong (Division of Research and Development, Korloy Inc.) ;
  • Paek, Yeong-Kyeun (School of Materials Science and Engineering, Andong National University)
  • 정태주 (안동대학교 신소재공학부) ;
  • 안선용 (한국야금(주) 생산기술연구소) ;
  • 백용균 (안동대학교 신소재공학부)
  • Published : 2005.03.01
Download PDF
⟨ Previous Next ⟩

Abstract

The effect of variation in particle size of WC and Co powder on the properties of WC-Co alloys was investigated. WC and Co powders having different particle sizes were used in the fabrication of $WC-10\;wt\%$Co composites. High hardness and low fracture toughness alloy was obtained with the decrease in WC particle size regardless of Co particle size. It was newly found in this investigation that the initial particle size of Co as well as WC had a great role in the microstructure and properties of WC-Co hard materials. The average grain size and fracture toughness of WC-Co alloys using same WC powder size increased and their hardness decreased with the use of relatively finer Co binder.

서로 다른 입자크기를 갖는 WC와 Co 분말 원료를 사용하여 $WC-10\;wt\%$Co 초경합금을 제조하였다. 이로부터 WC와 Co 원로. 입자크기가 제조된 초경합금의 성질에 미치는 영향에 대해 고찰하였다. WC 원료 입자크기가 클수록 제조된 초경합금이 파괴인성이 높고 경도는 낮게 나타나는데, 이러한 경향은 Co 원료 입자크기에 크게 영향 받지 않음을 알 수 있었다. Co 원료 크기의 영향 외에도 Co 원료 크기가 초경합금의 특성에 영향을 주는 것으로 밝혀졌는데, 동일한 WC 원료를 사용하여도 미세한 Co 원료를 사용할 경우, 보다 조대한 WC를 함유하여 인성이 우수한 초경합금을 제조할 수 있었다. 이로부터 Co 원료 입자크기가 초경합금의 미세구조 및 그 특성에 중요한 역할을 함을 알 수 있었다

Keywords

References

  1. H. E. Exner, 'Physical and Chemical Nature of Cemented Carbides,' Inter. Metals Reviews, 24 [4] 149-73 (1979) https://doi.org/10.1179/095066079790136363
  2. H. Suzuki, M. Sugiyama, and T. Umeda, 'Effect of the Carbon Content on Properties of WC-10%Co Alloy,' J. Jpn. Inst. Metals, 28 [2] 55-8 (1964) https://doi.org/10.2320/jinstmet1952.28.2_55
  3. F. V. Lenel, Powder Metallurgy Principles and Applications; pp. 383-400, Metal Powder Industries Federation, Princeton, New Jersy, 1980
  4. D. F. Carroll, 'Processing and Properties of Ultrafine WC/Co Hard Materials,' Proc. of the 14th Inter. Plansee, Conf., Vol. 2 complied by G. Knerringer, P. Rodhammer, and P. Wilhartiz, pp. 168-82, Metallwerk Plansee, Austia, 1997
  5. D. F. Carroll and C. L. Conner, 'Processing of Superfine WC Powders into High Quality WC/Co Materials,' Advances in Powder Metallurgy & Particulate Materials1997, complied by R. A. Mckotch and R. Webb, Metal Powder Industries Federation, p. 12/61-74, Princeton, New Jersy, 1997
  6. J. H. Han and D. Y. Kim, 'Analysis of the Proportionality Constant Correlating the Mean Intercept Length to the Average Grain Size,' Acta Metall. Mater., 43 [8] 3185-88 (1995) https://doi.org/10.1016/0956-7151(95)00007-I
  7. K. Niihara, R. Morena, and D. P. H. Hasselmann, 'Evaluation of $K_{IC}$ of Brittle Solids by the Indentation Method with Low Crack-to-Indent Ratios,' J. Mater. Sci. Lett., 1 13-6 (1982) https://doi.org/10.1007/BF00724723
  8. P. Walter and H. Grewe, 'The Dependence of Coercive Force upon Microstructure in Technical Hard Metal Alloys,' Powder Metallurgy Inter., 3 [4] 180-82(1971)
  9. S. Sundin and S. Haglund, 'A Comparison between Magnetic Properties and Grain Size for WC/Co Hard Materials Containning Additives of Cr and V,' Inter. J. Refract. Met. Hard Mater., 18 297-300 (2000) https://doi.org/10.1016/S0263-4368(00)00033-0
  10. G P. Angelus, Da Silva, N. F. Da Silva, and U. U. Gomes, 'Effect of Milling Technique on the Dispersion, Sintering and Hardness of WC-Co Hard Metals,' Inter. J. Powder Metallurgy, 37 [6] 57-66 (2001)
  11. S. J. Mashl, D. W. Smith, G H. Becking, and T. E. Hale, 'Attritor Milling of WC + 6% Co : Effects on Powder Characteristics and Compaction Behaviour,' Inter. J. Refract. Met. Hard Mater., 8 [1] 32-40 (1989)